

package components;

import java.awt.*;
import java.awt.event.*;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.ButtonGroup;
import javax.swing.JMenuBar;
import javax.swing.KeyStroke;
import javax.swing.ImageIcon;

import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JFrame;

/* MenuLookDemo.java requires images/middle.gif. */

/*
* This class exists solely to show you what menus look like.
* It has no menu-related event handling.
*/
public class MenuLookDemo {
   JTextArea output;
   JScrollPane scrollPane;

   public JMenuBar createMenuBar() {
       JMenuBar menuBar;
       JMenu menu, submenu;
       JMenuItem menuItem;
       JRadioButtonMenuItem rbMenuItem;
       JCheckBoxMenuItem cbMenuItem;

       //Create the menu bar.
       menuBar = new JMenuBar();

       //Build the first menu.
       menu = new JMenu("A Menu");
       menu.setMnemonic(KeyEvent.VK_A);
       menu.getAccessibleContext().setAccessibleDescription(
               "The only menu in this program that has menu items");
       menuBar.add(menu);

       //a group of JMenuItems
       menuItem = new JMenuItem("A text-only menu item",
                                KeyEvent.VK_T);
       //menuItem.setMnemonic(KeyEvent.VK_T); //used constructor instead
       menuItem.setAccelerator(KeyStroke.getKeyStroke(
               KeyEvent.VK_1, ActionEvent.ALT_MASK));
       menuItem.getAccessibleContext().setAccessibleDescription(
               "This doesn't really do anything");
       menu.add(menuItem);

       ImageIcon icon = createImageIcon("images/middle.gif");
       menuItem = new JMenuItem("Both text and icon", icon);
       menuItem.setMnemonic(KeyEvent.VK_B);
       menu.add(menuItem);

       menuItem = new JMenuItem(icon);
       menuItem.setMnemonic(KeyEvent.VK_D);
       menu.add(menuItem);

       //a group of radio button menu items
       menu.addSeparator();
       ButtonGroup group = new ButtonGroup();

       rbMenuItem = new JRadioButtonMenuItem("A radio button menu item");
       rbMenuItem.setSelected(true);
       rbMenuItem.setMnemonic(KeyEvent.VK_R);
       group.add(rbMenuItem);
       menu.add(rbMenuItem);

       rbMenuItem = new JRadioButtonMenuItem("Another one");
       rbMenuItem.setMnemonic(KeyEvent.VK_O);
       group.add(rbMenuItem);
       menu.add(rbMenuItem);

       //a group of check box menu items
       menu.addSeparator();
       cbMenuItem = new JCheckBoxMenuItem("A check box menu item");
       cbMenuItem.setMnemonic(KeyEvent.VK_C);
       menu.add(cbMenuItem);

       cbMenuItem = new JCheckBoxMenuItem("Another one");
       cbMenuItem.setMnemonic(KeyEvent.VK_H);
       menu.add(cbMenuItem);

       //a submenu
       menu.addSeparator();
       submenu = new JMenu("A submenu");
       submenu.setMnemonic(KeyEvent.VK_S);

       menuItem = new JMenuItem("An item in the submenu");
       menuItem.setAccelerator(KeyStroke.getKeyStroke(
               KeyEvent.VK_2, ActionEvent.ALT_MASK));
       submenu.add(menuItem);

       menuItem = new JMenuItem("Another item");
       submenu.add(menuItem);
       menu.add(submenu);

       //Build second menu in the menu bar.
       menu = new JMenu("Another Menu");
       menu.setMnemonic(KeyEvent.VK_N);
       menu.getAccessibleContext().setAccessibleDescription(
               "This menu does nothing");
       menuBar.add(menu);

       return menuBar;
   }

   public Container createContentPane() {
       //Create the content-pane-to-be.
       JPanel contentPane = new JPanel(new BorderLayout());
       contentPane.setOpaque(true);

       //Create a scrolled text area.
       output = new JTextArea(5, 30);
       output.setEditable(false);
       scrollPane = new JScrollPane(output);

       //Add the text area to the content pane.
       contentPane.add(scrollPane, BorderLayout.CENTER);

       return contentPane;
   }

   /** Returns an ImageIcon, or null if the path was invalid. */
   protected static ImageIcon createImageIcon(String path) {
       java.net.URL imgURL = MenuLookDemo.class.getResource(path);
       if (imgURL != null) {
           return new ImageIcon(imgURL);
       } else {
           System.err.println("Couldn't find file: " + path);
           return null;
       }
   }

   /**
    * Create the GUI and show it.  For thread safety,
    * this method should be invoked from the
    * event-dispatching thread.
    */
   private static void createAndShowGUI() {
       //Create and set up the window.
       JFrame frame = new JFrame("MenuLookDemo");
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

       //Create and set up the content pane.
       MenuLookDemo demo = new MenuLookDemo();
       frame.setJMenuBar(demo.createMenuBar());
       frame.setContentPane(demo.createContentPane());

       //Display the window.
       frame.setSize(450, 260);
       frame.setVisible(true);
   }

   public static void main(String[] args) {
       //Schedule a job for the event-dispatching thread:
       //creating and showing this application's GUI.
       javax.swing.SwingUtilities.invokeLater(new Runnable() {
           public void run() {
               createAndShowGUI();
           }
       });
   }
}
